By 1816 he was living in Giles County, Tennessee, where he owned a plantation. He had two sons: James Maclin Robertson with Rachael Smith, and Elijah Sterling Clack Robertson with Frances King. On March 2, 1822, he was one of the seventy stockholders of the Texas Association who signed a memorial to the Mexican government, asking for permission to settle in Texas.
|Independence Hall, location of the Declaration signing|
He was stationed at Harrisburg to guard army equipment during the battle of San Jacinto. Robertson served as senator from the District of Milam in the First and Second congresses of the Republic of Texas (October 3, 1836 - May 24, 1838), after which he retired to his home in Robertson County, where he became the earliest known breeder of Arabian horses in Texas. He died there on March 4, 1842. His remains were removed to Austin and reinterred in the State Cemetery on December 29, 1935. Robertson was responsible for settling more than 600 families in Texas.
30° 15.914, -097° 43.630
Texas State Cemetery